I think it has to be LBT 4 (Ali, Archie, Ichty, Dill, Tickles, The Old one and (she doesn't do or say anything important though) Ali's mother). This would make seven new characters.
Number 2 I think would be LBT 3 and 10 with four characters each (Hyp, Hyp's father, Nod, and Mutt respectively Bron, Sue, Pat and Shorty).